# lis=[j-i for i in range(10) for j in range(11,21)]
# print(lis)

# a='a'
# print(a[1:])

# k=[1,2,3]
# l=[4,5,6]

# q={1,2,3}
# p={4,5,6}
# print(k+l)
a={'2':{}}
a['2']['3']=23
print(a)
